Between brackets is the number of accepted species

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- Mollusca (132 791)
- Subphylum Aculifera
- Subphylum Conchifera
- Subphylum Placophora accepted as Polyplacophora
- Superclass Aplacophora
- Class Amphineura accepted as Aculifera
- Class Bivalvia (25 009)
- Class Caudofoveata (143)
- Class Cephalopoda (1 834)
- Class Conchifera accepted as Bivalvia
- Class Cricoconarida † (1)
- Class Gastropoda (102 697)
- Subclass Amphigastropoda † (390)
- Subclass Angiogastropoda represented as Gastropoda
- Subclass Apogastropoda
- Subclass Caenogastropoda (53 636)
- Subclass Gastropoda incertae sedis (308)
- Subclass Heterobranchia (39 156)
- Infraclass "Lower Heterobranchia" (1 137)
- Infraclass Euthyneura (37 433)
- Subterclass Acteonimorpha (411)
- Superfamily Acteonoidea A. d'Orbigny, 1842 (332)
- Family Acteonidae A. d'Orbigny, 1842 (262)
- Genus Actaeon Ersch & Gruber, 1818 accepted as Acteon Montfort, 1810
- Genus Actaeonidea Gabb, 1873 † accepted as Rictaxis Dall, 1871
- Genus Actaeonina [sic] † accepted as Acteonina A. d'Orbigny, 1850 †
- Genus Acteon Montfort, 1810 (126)
- Genus Acteonina A. d'Orbigny, 1850 † (3)
- Genus Bathyacteon Á. Valdés, 2008 accepted as Metactaeon Thiele, 1931
- Genus Buccinulus Herrmannsen, 1852 accepted as Pupa Röding, 1798
- Genus Bulimactaeon Cossmann, 1892 † (1)
- Genus Callostracon sensu F. Nordsieck, 1972 accepted as Callostracon Repetto & Bianco, 2012
- Genus Callostracon Repetto & Bianco, 2012 (3)
- Genus Colostracon Hamlin, 1884 † (1)
- Genus Crenilabium Cossmann, 1889 (15)
- Genus Crenilabrum accepted as Crenilabium Cossmann, 1889
- Genus Dactylus Schumacher, 1817 accepted as Pupa Röding, 1798
- Genus Eoacteon L. W. Stephenson, 1955 † accepted as Crenilabium Cossmann, 1889
- Genus Fortisia Bayan, 1870 † accepted as Liocarenus G. F. Harris & Burrows, 1891 †
- Genus Hemiauricula Deshayes, 1853 † (2)
- Genus Inopinodon Bouchet, 1975 (1)
- Genus Japanacteon [sic] accepted as Japonactaeon Is. Taki, 1956
- Genus Japonactaeon Is. Taki, 1956 (12)
- Genus Japonacteon [sic] accepted as Japonactaeon Is. Taki, 1956
- Genus Lanayrella Salvador & C. Cunha, 2020 (2)
- Genus Liocarenus G. F. Harris & Burrows, 1891 † accepted as Hemiauricula Deshayes, 1853 † (1)
- Genus Lissactaeon Monterosato, 1890 accepted as Crenilabium Cossmann, 1889
- Genus Maxacteon Rudman, 1971 accepted as Punctacteon Kuroda & Habe, 1961
- Genus Metactaeon Thiele, 1931 (2)
- Genus Mysouffa Ev. Marcus, 1974 (2)
- Genus Neactaeonina Thiele, 1912 (6)
- Genus Neoacteonina [sic] accepted as Neactaeonina Thiele, 1912
- Genus Nucleopsis Conrad, 1865 † (1)
- Genus Obrussa Iredale, 1925 accepted as Obrussena Iredale, 1930
- Genus Obrussena Iredale, 1930 (3)
- Genus Ongleya H. J. Finlay & Marwick, 1937 † (1)
- Genus Ovactaeonina Cossmann, 1895 † (3)
- Genus Ovulactaeon Dall, 1889 (2)
- Genus Pitharella F. E. Edwards, 1860 † (1)
- Genus Pseudactaeon Thiele, 1925
- Genus Punctacteon Kuroda & Habe, 1961 (15)
- Genus Pupa Röding, 1798 (23)
- Genus Rapturella Salvador & C. Cunha, 2016 (3)
- Genus Ravniella Rosenkrantz, 1970 † (1)
- Genus Rictaxis Dall, 1871 (7)
- Genus Semiactaeon Cossmann, 1889 †
- Genus Solidula Fischer von Waldheim, 1807 accepted as Pupa Röding, 1798
- Genus Speo Risso, 1826 accepted as Acteon Montfort, 1810
- Genus Strigopupa Habe, 1958 accepted as Pupa Röding, 1798
- Genus Tenuiactaeon Aldrich, 1921 † (2)
- Genus Tornatella Lamarck, 1816 accepted as Acteon Montfort, 1810 (1)
- Genus Tornatellaea Conrad, 1860 † (14)
- Species Tornatellaea affinis (J. De C. Sowerby, 1836) †
- Species Tornatellaea albensis (A. d'Orbigny, 1842) †
- Species Tornatellaea bella Conrad, 1860 †
- Species Tornatellaea cretacea Wade, 1926 †
- Species Tornatellaea darwini Stilwell & Zinsmeister, 1992 †
- Species Tornatellaea globulosa Wade, 1926 †
- Species Tornatellaea heberti (Piette, 1856) †
- Species Tornatellaea incompta H. J. Finlay & Marwick, 1937 †
- Species Tornatellaea lacryma (Michelin, 1834) † accepted as Ringinella lacryma (Michelin, 1834) †
- Species Tornatellaea lapparenti Cossmann, 1895 †
- Species Tornatellaea morbosa H. J. Finlay & Marwick, 1937 †
- Species Tornatellaea parisiensis (Deshayes, 1862) †
- Species Tornatellaea quindecimlirata Darragh, 1997 †
- Species Tornatellaea saucia H. J. Finlay & Marwick, 1937 †
- Species Tornatellaea simulata (Solander, 1766) †
- Species Tornatellaea subovalis (P. Marshall, 1917) †
- Species Tornatellaea triplicata Kollmann, 1976 †
- Genus Tornatellaeinae Bandel & Dockery, 2016 † accepted as Acteonidae A. d'Orbigny, 1842
- Genus Triploca Tate, 1894 (2)
- Genus Volvaria Lamarck, 1801 † (5)
- Genus Volvariella P. Fischer, 1883 † accepted as Volvaria (Volvariella) P. Fischer, 1883 †
- Genus Wangacteon Stilwell, 1993 † (1)
- Family Aplustridae Gray, 1847 (43)
- Family Bullinidae Gray, 1850 accepted as Aplustridae Gray, 1847
- Family Cylindrobullinidae Wenz, 1938 † (18)
- Family Hydatinidae Pilsbry, 1895 accepted as Aplustridae Gray, 1847
- Family Nonacteoninidae Bandel, 1994 † accepted as Aplustridae Gray, 1847 (1)
- Family Pupidae Kuroda, 1941 accepted as Acteonidae A. d'Orbigny, 1842
- Family Solidulidae Meek & Hayden, 1860 accepted as Acteonidae A. d'Orbigny, 1842
- Family Sulcoactaeonidae Gründel, 1997 † accepted as Aplustridae Gray, 1847
- Family Tornatellidae J. Fleming, 1828 accepted as Acteonidae A. d'Orbigny, 1842
- Family Tubiferidae Cossmann, 1895 † (8)
- Family Zardinellidae Bandel, 1994 †
- Superfamily Rissoelloidea Gray, 1850 (79)
- Subterclass Ringipleura (2 917)
- Subterclass Tectipleura (34 105)
- Superorder Euthyneura incertae sedis
- Infraclass Heterobranchia incertae sedis (478)
- Infraclass Mesoneura (108)
- Infraclass Opisthobranchia
- Infraclass Pulmonata
- Subclass Neomphaliones accepted as Vetigastropoda
- Subclass Neritimorpha (1 914)
- Subclass Orthogastropoda represented as Gastropoda
- Subclass Patellogastropoda (511)
- Subclass Prosobranchia
- Subclass Psilogastropoda represented as Gastropoda
- Subclass Vetigastropoda (6 782)
- Class Lamellibranchiata accepted as Bivalvia
- Class Loricata accepted as Polyplacophora
- Class Mollusca incertae sedis † (372)
- Class Monoplacophora (229)
- Class Pelecypoda accepted as Bivalvia
- Class Polyplacophora (1 377)
- Class Polyplaxiphora accepted as Polyplacophora
- Class Rostroconchia † (64)
- Class Scaphopoda (752)
- Class Solenoconchia accepted as Scaphopoda
- Class Solenogastres (313)
- Subclass Chaetodermomorpha accepted as Caudofoveata